RemoteFX driver not available in guest (RDSH)

Hi,

I have an Hyper-V Host based on Windows Server 2012 Datacenter. I also installed a new Nvidia Quadro 4000 card with the latest Win2012 drivers.

In Hyper-V Setting the card can be selected as GPU. I also can add the RemoteFX Card to the VM-Settings - but in the VM i can only the "Microsoft Basic Display Adapter" on two "Unknown Devices".

As VM I tried Windows Server 2012, Windows Server 2008 and Windows 8 Professional. All the same. I'm not able to get the VM runnig with the RemoteFX driver.

The CPU support SLAT. The OnBoard VGA is disabled. 

Here the VM - Settings: